Should I use das.failuredetectiontime or das.config.fdm.isolationPolicyDelaySec

Today I received a question around the use of das.failuredetectiontime and das.config.fdm.isolationPolicyDelaySec. Should you be using these advanced settings?

Short answer: no.

Long answer: This myth has been floating around for a long long time. Many people were under the impression that das.failuredetectiontime needed to be configured when you started adding additional isolation addresses.This is not the case!

I just received an email with the question if the same applied to vSphere 5.1 now that “das.config.fdm.isolationPolicyDelaySec” was introduced as a replacement for das.failiredetectiontime. The answer remains “no you should not be using this. Unless, unless there are specific networking requirements to do so. There is absolutely no need to increase the failure detection time / isolation policy delay when multiple isolation addresses are configured. Isolation addresses are pinged in parallel, which means no additional time is needed to complete this process.

In summary, it is not recommended to use these advanced settings unless you have specific networking requirements to do so.

About Duncan Epping

Duncan Epping is Chief Technologist working for VMware. He serves as a partner and trusted adviser to VMware's customers primarily in EMEA. Main responsibilities are ensuring VMware's future innovations align with essential customer needs and and translating customer problems to opportunities. Duncan specializes in software defined storage, hyper-converged infrastructures and business continuity / disaster recovery solutions. Duncan has one patent granted and three patents pending on the topic of availability, storage and resource management. He was among the first VMware certified design experts (VCDX 007). He is the co-author of several books, including the vSphere Clustering Deepdive series and Essential Virtual SAN. He is the owner and main author of the leading virtualization blog yellow-bricks.com.

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